MP28310 2-5.5V, 300mA Step-Down Converter

MP28310 2-5.5V, 300mA Step-Down Converter

The MP28310 is a monolithic power management unit containing a 300mA, high- efficiency, switching step-down converter and a 100mA low-dropout (LDO) regulator.

Key Specifications

Features

• 100mA LDO o Ultra-Low 300nA IQ o 2V to 5.5V Operating Input Range o 3 Selectable Output Voltages o Over-Temperature Protection (OTP)
• Available in a CSP-12 (1.2mmx1.6mm) Package

Typical Application Circuit

Applications

• Wearables
• Internet of Things (IoT)
• Portable Instruments

Design Notes

• Rail sequencing order and delay are part of the SoC power-up contract; a wrong order latches the processor even though every rail is in spec.
• In multiphase designs, current balance depends on the loop matching between phases, so keep the layout symmetric.
• Digital interfaces (PMBus, I²C) need pull-ups to the correct rail and a defined state during power-up.
• Thermal design is a system problem here: the PMIC sits next to the load it feeds, so budget the shared copper, not the package alone.

Common Questions